Box-hoop-strapping mechanism



' s. .1; DUNN BOX HOOP STRAPPING MECHANISM Jan. 12 1926.

Filed June 5, 1924 Patented Jan. 12, 1926.

UNITED STATES PATENT. OFFICE.

BOX-HOOP-STRAPPING MECHANISM.

Application filed June 5,

To all whom it may concern:

I Be it known that I, SAMUEL JAMES DUNN, a subject of the King of Great Britain, residing at 'Windsor, in the State of- Victoria, Commonwealth of Australia, have invented certain new and useful Improvements in BoX-I-Ioop-Strapping Mechanism, of which the following is a specification.

This invention refers to a box strapping mechanism adapted to be used generally in conjunction with nailing machines in the construction of cases and has been devised to produce an improved apparatus that will ensure the necessary tension being applied to the hoop-iron just prior to the nailing operation, means being provided to prevent excessive tension that is the cause of the hoopiron strip being prematurely severed.

The invention is illustrated as applied to a nailing machine,

Figure 1 being an elevation of the apparatus with a case in position and,

Figures 2, 3, and 4 enlarged fragmentary details of parts.

The apparatus comprises a stationary plate 1 which may be fixed to the stationary frame 2 of the nailing machine said plate having an opening or recess into which projects one end of the back gauge 4: for the case. Said plate also has an offset arm 5 to which is fixed a vertical side guide plate 6 for the case.

Mounted on a pivot 33 on the plate are two grippers 7 and 8 one in front of the T other provided at their upper ends with superposed jaws 9, 10 formed by bending the upper ends of said grippers. The inner or operated gripper 8 is urged towards the case by a spring 11 connected to the arm 5 I and a stop pin 12 on the plate limits its movement in this direction.

The outer or operating gripper 7 has an outwardly projecting arm 13 formed with an elongated slot 1 1 so that by the first depressing movement of said arm, jaw 9 jambs the hoopiron 15 against jaw 10 and continued movement of the arm puts the hoopiron in tension, said iron being then nailed.

WVhen the apparatus is applied to a nailing machine the arm 13 is actuated by a connecting rod or bar 16 connected to a bracket 17 on the vertically sliding head 18 of the nailing machine. Said rod 16 is bifurcated at its lower end and has a pin 19 passed through the slot 14 of arm 13 and a spring 20 is fixed at one end to the lower 1924. Serial No. 718,153.

end of the rod and at the other end to the plate 1. The upper end of the rod is also bifurcated and is adjustably connected to the bracket 17 by means of a pivotal bolt 21 passed through one of a series of holes 22 formed in the bracket. By means of this construction the descent of the sliding head 18 of the nailing machine causes the arm 13 to be depressed and the jaws to grip and strain the hoop iron and during the last movement of the arm when the nails are being driven through the hoopiron further. tension of the latter is prevented by a pin 19 of rod 16 sliding along slot 14 of arm 18 and when the operation is completed and the head 18 rises, spring 20 returns the lower end of the rod 16 and arm 13 is raised.-

Gripper 8 by reason of spring 11 is drawn back till it contacts with stop pin 12 and a stop pin 23 on gripper 8 projects in the path of gripper 7 and limits its backward movement. The result is that the jaws 9 and 10 are open so that the hoop iron 15 may be drawn through same as the case C is turned over to bind the next side.

It will be readily understood that the arm 13 of the operating gripper 7 may be connected direct to a foot operated treadle instead of being connected as shown with the reciprocating head of a nailing machine.

During straining operations by the jaws the end of the hoop iron is held immovable and in the most convenient way it may be secured by a cam gripper 2 1 fixed to one end of the back gauge 4.

The plate 1 is provided with shears for severing the hoop iron 15 when necessary and the iron is fed over the stationary blade 25 and the pivoted blade 26 is provided with an operating handle 27 controlled by a spring 28.

In order to bind cases that have sides of different lengths an adjustable basefor the case is provided. This base 29 is supported at each side on links 30 pivoted on a ledge 31 and one link is provided with a handle by means of which the base 29 may be raised to the required height. hen raised to its extreme height the edge of the base bears against abutments 82 provided on the ledge 31.

I claim 1. A hoopiron straining apparatus comprising a stationary element, a lever mounted on a pivot thereon, and formed at its end with a jaw, a gripper mounted on said pivot and formed at its outer end With a j aw coacting With the aw on said lever and a spring connected at one end to said gripper and at the other end to said stationary element.

2. A hoopiron straining apparatus comprising a stationary element, an arm bent at its end to form a gripper provided With a terminal W. a pivot on the stationary elenient on which said arm is mounted another 10 gripper mounted on said pivot and formed with a jaw coacting with the jaw on the aforesaid gripper and a spring connected at one end to said second named gripper and at the other end to said stationary ele- 15 ment.

Dated this sixth day of May, 1924.

SAMUEL JAMES DUNN. 

